Portable support device



FIG. 1 is a top perspective view of a portable support device showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevation view thereof, the right side elevation view being a mirror image of the left side elevation view;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a bottom perspective view thereof; and,

FIG. 6 is a bottom plan view thereof. 

CLAIM The ornamental design for a portable support device, as shown and described. 